The Cummins 6.7L turbo diesel engine entered its fifth generation in 2019. In addition to improved output of up to 400 horsepower and 1,000 pound-feet of torque, the new engine's valve train featured ...

"Bullwinkle, that trick never works. Why don't you figure out how to make hydraulic roller lifters survive big spring pressure." "Huh?" Like Bullwinkle, hydraulic roller lifters get no respect. It ...

Mechanical lifters were once commonplace in internal combustions engines, but they've been mostly replaced by hydraulic lifters, which offer a lot of benefits.

Not so many years ago, roller cams were considered exotic, race engine fare. But today, new small-block Chevys are produced by the thousands every day with hydraulic-roller cams. The factories build ...